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Re: [Qemu-devel] Modularizing QEMU RFC
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] Modularizing QEMU RFC |
Date: |
Mon, 03 Aug 2015 10:58:41 +0100 |
Marc Marí <address@hidden> writes:
> On Mon, 03 Aug 2015 10:24:56 +0100
> Alex Bennée <address@hidden> wrote:
>
>>
>> Marc Marí <address@hidden> writes:
>>
>> > On Mon, 3 Aug 2015 16:22:34 +0800
>> > Fam Zheng <address@hidden> wrote:
>> >
>> >> On Mon, 08/03 09:52, Marc Marí wrote:
>> >> > So any other ideas to reduce the library overhead are
>> >> > appreciated.
>> >>
>> >> It would be interesting to see your profiling on the library
>> >> loading overhead. For example, how much does it help to reduce the
>> >> library size, and how much does it help to reduce the # of
>> >> libraries?
>> <snip>
>> >
>> > Some profiling:
>> >
<snip>
>> >
>> > I don't know if loading one big library is more efficent than a lot
>> > of small ones, but it would make sense.
>>
>> What's the actual use-case here where start-up latency is so
>> important? If it is an ephemeral cloudy thing then you might just
>> have a base QEMU with VIRT drivers and one big .so call "the-rest.so"?
>>
>
> Clear Containers: https://lwn.net/Articles/644675/
>
> We are looking for making QEMU more lightweight for the general use
> case and also for the container use case. It is a lot better to have
> the same tool for both cases, and not start a new one from scratch as
> Intel has done.
>
> This also benefits the general QEMU community, and that's why I'm
> having this discussion here. If there's a point where QEMU is still too
> slow for containers, but optimizing means breaking, then we will have
> to take a step back and change the point of view.
>
> And making QEMU modular I think is benefitial for everyone.
Thanks for the link.
If all the less used parts of QEMU where wrapped up into a dynamically
linked library (rather than a dynamically loaded module) wouldn't you
get the best of both worlds? A fast loading executable which only
instantiated the rest if a function from the library was actually called?
>
> Marc
--
Alex Bennée
Re: [Qemu-devel] Modularizing QEMU RFC, Daniel P. Berrange, 2015/08/03
Re: [Qemu-devel] Modularizing QEMU RFC, Paolo Bonzini, 2015/08/03